Let-off mechanism for looms for weaving double pile fabrics



(No Model.) 2 Sheets-Sheet 1.

O. OOUPLAND.

LET-OFF MECHANISM FOB. LOOMS FOR WEAVING DOUBLE PILE.FABRICS..

No. 365,910. Patented July 5, 188 7.

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N, PETERS, PhoQB-Lilhognphpr.Washington. 11:5;

(No Model.) -2 Sheets-Sheet 2;

0. OOUPLAND. LET-OFF MECHANISM FOR LOOMS FOR WEAVING DOUBLE PILE FABRICS... No. 365,910. Patented July 5, 1887.

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UNITED STATES- PATENT OFFICE.

CHARLES OOUPLAND, OF SEYMOUR, CONNECTICUT.

LET-OFF MECHANISM FOR LOOMS FOR WEAVING DOUBLE PILE FABRICS.

SPECIFICATION forming part of Letters Patent No. 365,910, dated July 5, 1887.

Application filed March 29, 1883. Serial No. 89,788. (No model.)

To aZZ whom it may concern.-

Be it known that 1, CHARLES COUPLAND, of Seymour, in the county of New Haven and State of Connecticut, have invented certain Improvements in Let-Off Mechanisms for Looms forNVeaving Double Pile Fabrics, of which the following is a specification.

This invention comprises a combination of parts which form an improved let-off mechanism for the duplicate pile warps of looms employed for weaving double pile fabrics, in which mechanism the weighted rolls, their guides, and warp-tension guide-rolls are arranged and disposed in such relation as to produce a let-oif mechanism of simple and durable construction, of easy movement and performance in its action upon the duplicate pile warps, and capable of maintaining identity in the let-off action for both warps.

My improvement residesin the combination, relative disposition, and arrangement of the weighted rolls, their guides and warp-tension guiderolls for the duplicate warps illustrated in the drawings, and which I will now describe, and specifically point out in my claim.

Figure 1 is a vertical longitudinal section, taken in the line 00 x of Fig. 2, of those portions of a loom more immediately concerned in the practice of my said invention. Fig. 2 is a front view illustrating the construction and operation of the parts. Fig. 3 is a View corresponding to Fig. l, but taken in the line y y of Fig. 2; and Fig. 4 is a sectional detail view, 011 a larger scale, of certain parts of the apparatus.

The said drawings relate to aloom designed for the simultaneous production of two parallel fabrics, such as what are included in what I have heretofore designated as a double pile fabric.

A is the one warp and B is the other. The warp A passes from the usual warp-roller, C, over the idler-roller D, thence downward and underneath the loaded roller E, which is suspended in the pendent loop of the warp in such manner as to be bodily supported thereby, thence upward over the idler-roller F, thence downward under the idler roller or bar G,and thence in the direction of the headed-arrow of Fig. 1 to the heddles of the loom, where it is operated in the usual manner and by theusual mechanism. This arrangement of the warp A, including the location of the loaded roller E in the pendent loop thereoflis substantially the same as that existingin the ordinary loom.

H is a lever pivoted at one end, as shown at a, while the opposite end is provided with a strap, 1), which passes downward around the loaded roller E. Extended from the pivoted end of the lever H,around the ad jacent end of the roller 0, is a friction strap or brake, I, the opposite end of which is at tached to the lever H, more or less adjacent to the free or swinging end of the said lever, as indicated at c. \Vhcn the warp tightens as the woven fabric is drawn forward by the tale ing-up mechanism, the loop of the said warp is shortened, thereby lifting the loaded roller E. It follows that the upward movement of the said roller gives a corresponding movement to the free end of the lever H, and consequeutl y lessens the pressure or frictional contact of the strap or brake I upon the roller 0, thereby enabling said roller to yield and rotate more readily to the strain exerted thereon by the draft on the warp; and, conversely, that when the undue tension upon the w arp.has been by this means relieved the downward movement of the roller E, as the loop of the warp slackens, will depress the free end of the lever H, and in a proportionate degree apply with increased pressure the strap or brake to the roller 0, so that inasmuch as the roller 0 is permitted to turn more readily whenever the roller suspended in the loop is lifted by the tightening of the warp, and less readily when said warp becomes sufficiently slack again to permit a downward movement or dropping of said suspended roller,it follows that a substantially uniform tension of the warp is secured. The warp 13, starting from the roller J, passes over the idler-roller e, thence downward underneath thesecond loaded roller K,theuce upward over the idler rollers or bars f g, thence downward under the similar roller or bar, 71., and thence in the direction of the unheaded arrow in Fig. 1 to the heddles of the loom. The loaded roller K is connected by a strap,b,with the end of a lever, h, which in its turn is provided with a friction strap or brake, J, which passes around the roller J for operation in the same manner that the strap or brake I is 0p-v erated with reference to the roller 0. In other words, the tension-regulating mechanism provided, as described, to control the tension of the warp A, is duplicated to control that of the warp B, so that by the said means both of the said warps are easily controlled, not only to keep a uniform tension for each, but to keep a tension uniform in relation with each other, thereby insuring identity of character in the two fabrics, as the same are simultaneously produced in the manufacture of double pile fabrics, as hereinbefore set forth.

I do not claim, broadly, the combination with the warp-roll of a loom of a brake device actuated through a lever connected with a roller placed in the loop of a warp, the same having been heretofore proposed in various patents or publications; neither do I claim, broadly, the combination in a loom for weaving double fabrics of two let-off mechanisms arranged to act upon the two warps fromwhich the two fabrics are made, various devices for such purpose, although inferior to my saidinvention, having been heretofore proposed.

The relative disposition and arrangement of the parts in accordance with my improvement, and which I will now more specifically state, are as follows: The guiding-rolls D F for one warp and the guiding-rolls e ffor the other warp are grouped in upper and lower pairs at the upper part of the mounting-frame, the up per pair closer together than the lower pair, and the third roll, is placed at one side of the upper pair, while the guide-rolls G h are placed at the lower part of the said frame for receiving the warps from the top rolls, F 9, near the lower weighted roller, E, as shown. Below,and in vertical or substantially vertical line between the said top pairs of rolls, are disposed, one above the. other, the duplicate loaded rollers E and K,held in properrelation in slots in the guide-rods Z, which are disposed uprightly between the said top rolls. The duplicate levers H h are placed one above each weighted roller, are positively connected therewith, and extend horizontally, the upper one, h, above the lower warp-roller, O, and are pivoted at their outer ends to the mountingframe.

What I claim as my invention is The herein-described combination of parts, constituting a let-off mechanism for duplicate pile warps for looms employed for weaving double pile fabrics, the said parts consisting of the guiding-rolls D F for one warp, the guiding-rolls e f for the other warp grouped in upper and lower pairs, the upper pair closer together than the lower pair, a third guideroll, 9, at oue'side of the upper pair,the pairs of rolls being at the top of the mountingframe, and the guide-rolls G h at the lower part of the said frame,for receiving the warps from the top rolls, F g, the duplicate loaded rollers E and K, located below and in vertical or substantially vertical line between the said top pairs of rolls, the 'slotted guide-rods for said loaded rolls disposed uprightly between said top rolls, the duplicate levers H h, having positive connection with said loaded rollers, the duplicate friction straps or brakes I J, and

the warp-rollers O J, all connected, arranged,

and disposed for operation, as shown and described. v

CHARLES OOUPLAND. 

